1
by Babbie, Earl R.
Published 1986
2
by Jensen, Lloyd.
Published 1982
3
by Mokhtar Ismail
Published 2010
4
by Babbie, Earl R.
Published 2010
5
Published 2011
6
7
8
by Chua Yan Piaw
Published 2006
9
Published 2015
10
Published 2012
11
by Ratnam
Published 2004
12
Published 2005
13
Published 2005
14
Published 1982
15
16
by Pochhacker
Published 2003
17
18